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Ivo Kostov
Department of Economics and Management of Construction Faculty of Economics University of Economics – Varna Bulgaria
Sławomir Palicki
Department of Spatial and Environmental Economics Faculty of Management Poznań University of Economics and Business Poland
Izabela Rącka
Department of Management and Public Law Faculty of Social Sciences and Humanities The President Stanisław Wojciechowski State University of Applied Sciences in Kalisz Poland